CN202062364U

CN202062364U - Power tool

Info

Publication number: CN202062364U
Application number: CN2010206767423U
Authority: CN
Inventors: 周红陶
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2010-12-07
Filing date: 2010-12-07
Publication date: 2011-12-07
Anticipated expiration: 2020-12-07

Abstract

The utility model provides a power tool, which comprises a driving shaft, a fastening element and a locking component. The driving shaft drives an operating element, the fastening element fastens the operating element onto the driving shaft and is provided with an extending shaft capable of being inserted into the driving shaft, the locking component locks the extending shaft into the driving shaft, the locking component consists of a locking part, the locking part has a locking position and a releasing position, the extending shaft is locked at the locking position and released at the releasing position, the fastening element is abutted to the end of the driving shaft in a clamped manner by the aid of an elastic element, the locking component further consists of a moving part disposed outside the driving shaft, the driving part is provided with a first portion and a second portion which can directly or indirectly match with the locking part, and the radial distance from the first portion to the axle center of the driving shaft is unequal to the radial distance from the second portion to the axle center of the driving shaft. The power tool can realize quick clamping, is compact in structure, is favorable for lengthening the arm of force of a wrench by means of arranging the moving part outside the driving shaft, and achieves the purpose of saving labor.

Description

Power tool

Technical field

The utility model relates to a kind of power tool, this instrument comprises output shaft that is used for driven tool and the securing member that is used for operation element is clamped to described output shaft end, comprise that also one is used to mobile device that described securing member can be moved between off-position and clamped position, locate in the off-position, securing member is by breaking away from mobile device and can removing from output shaft, otherwise, at the clamped position place, securing member by mobile device sealed and flexible member synergy prop up by output shaft end and make the firm clamping of operation element.

Background technology

From the known a kind of power tool of US006569001B2 with fast fixture, this handheld tool is an electric angle grinder, electric angle grinder is equipped with the output shaft of hollow therein, the clamping device that can axially move between clamped position and off-position along axle is installed in the hollow mandrel, this clamping device comprises that a middle part is provided with the clamping flange of threaded, thereby this clamping flange is used for the relative flange cooperation of hollow mandrel end operation element being clamped between the two, one thrust component that cooperates with threaded also is set in hollow mandrel, when clamped position, in the screw thread of threaded precession thrust component and under the spring force effect, remain on this clamped position, when the off-position, thereby thrust component promotion threaded drive clamping flange overcomes the spring force effect and breaks away from the operation element of clamping is surperficial, since this moment clamping flange and be held when relatively rotating between the operation element and do not had frictional force, so need not just can change operation element easily manually with the threaded back-out thrust component of clamping flange by annex.

Although need not aid, this clamping device just can basically operation element be clamped on the output shaft of handheld tool, but this clamping device is only applicable to clamp the operation element that is rotated driving, if operation element is driven by vibrating device, so that operation element is along the longitudinal axis swing of output shaft, then this causes producing bigger sudden change torque and have great impact on the both direction that rotates, and can not guarantee the abundant firm grip of operation element by known clamping device.

Summary of the invention

Defective at above-mentioned prior art existence, the utility model provides a kind of power tool, this power tool is fastened to operation element on the output shaft by the better way mode, and need not to use aid such as spanner etc., and can realize stronger clamping force, even under the impact condition that occurs in the instrument that for example drives by vibratory driver, this clamping force also sufficient to guarantee reliably and securely clamps operation element.

For solving above technical problem, the utility model adopts following technical scheme:

A kind of power tool comprises:

Drive the driving shaft of operation element;

Described operation element is fastened to tightening member on the described driving shaft, and described tightening member has the projecting shaft that can be inserted in the described driving shaft;

Described projecting shaft is locked in latch assembly in the described driving shaft, and described latch assembly comprises locking member, and described locking member has the locked position of the described projecting shaft of locking and the released position of unclamping described projecting shaft;

In described locked position, described tightening member relies on the end of described driving shaft by the flexible member folder;

Wherein: latch assembly also comprises is located at the outer moving member of driving shaft, moving member has first and second portion, the radial distance in the axle center of the radial distance in the axle center of first's relative drive shaft and second portion relative drive shaft is unequal, when first cooperates with locking member directly or indirectly, locking member is on the locked position, when second portion cooperated with locking member directly or indirectly, locking member was on the released position.

The locking portion that can directly cooperate with described first and second portion is set on the described locking member.

Described locking portion can be configured to have the part on inclined-plane.

Described latch assembly also comprises the middleware that places between described locking member and the described moving member, and described middleware selectively is positioned in the first of described moving member or on the second portion.

Further, be to strengthen the fixing of locking, on the projecting shaft of described tightening member and described locking member be provided with the shaping locking member, be used for described projecting shaft is fixed on described locked position with being shaped locking.

The projecting shaft of described securing member is provided with toothed portion, and described toothed portion cooperates with coupling toothed portion on the described locking member.

Described locking member can move between described locked position and released position, and its direction that moves is in fact perpendicular to described projecting shaft.

Also comprise mobile device, described mobile device and described flexible member cooperate makes described moving member move on the axis direction of described driving shaft.

After operation element is held tight and starting oscillation operation, the latch assembly of clamping operation element can be swung thereupon together, for avoiding this swing to be delivered on the mobile device, when described locking member was in the locked position, described mobile device can be thrown off a distance by described relatively moving member.

Effect has a biased element on the described locking member, described biased element with described locking member to the direction bias voltage that overcomes the thrust that produces when described projecting shaft inserts.

On described locking member end face, be provided with the boss on band inclined-plane, be used for cooperating with described locking member to center bias voltage radially with described biased element.This structure is arranged so that locking member has the elasticity pretightning force to the center, when toothed portion carries out tooth on locking member and projecting shaft, can produce the sense of movement or the sound of " whip ", strengthens operation sense.

Described locking member is located in the cavity volume of described driving shaft, and described moving member is located at outside the described driving shaft, and be connected with on it pass described driving shaft can with the connector of described locking member butt.

Described moving member is configured to be set in the sliding sleeve on the described driving shaft, and described middleware is configured to be placed in steel ball or the pin in the hole on the described driving shaft.

Described driving shaft is driven by the mode with vibration about its longitudinal axis.

By adopting above technical scheme, power tool of the present utility model can be realized the quick clamping of operation element, and it is easy to use and laborsaving, and simple and compact structure, and cost reduces greatly; Moving member is arranged on the side that driving shaft helps spanner is placed on the working head zone of instrument outward, the arm of force of spanner can be extended, thereby reach the labour-saving purpose.

Description of drawings

Fig. 1 is the cutaway view in power tool working head of the present utility model zone, and wherein, the fastened element of operation element is fastened on the axle head of driving shaft, and locking member is on the position that the projecting shaft of tightening member is locked;

Fig. 2 is the cutaway view in power tool working head of the present utility model zone, and wherein, operation element can discharge from the driving shaft axle head by fastened element, and locking member is on the position that the projecting shaft with tightening member unclamps;

Fig. 3 is along the schematic diagram in B-B cross section among Fig. 1;

Fig. 4 is the assembly exploded view of Fig. 1 medium power instrument;

Fig. 5 is the cutaway view in power tool working head of the present utility model zone, and wherein, latch assembly has another kind of embodiment;

Fig. 6 is the cutaway view in power tool working head of the present utility model zone, and wherein, latch assembly has another embodiment.

The specific embodiment

As shown in Figures 1 to 4, the power tool 20 that preferred a kind of mode with vibration of the utility model drives operation element 40 describes, the Power Available Shaft 23 of power tool 20 is by bearing 21,24 support and under the effect of vibration rack 22 around the reciprocally swinging of its axis Y with little deflection angle high frequency, driving shaft 23 is configured to support axle journal 231 parts and hollow mandrel 232 parts, vibration rack 22 interference are fitted in to be supported on the axle journal 231, supporting axle journal 231 press-fits with hollow mandrel 232 interference, support axle journal 231 and hollow mandrel 232 and be surrounded by cavity volume 233, the axle head 234 of driving shaft 23 is provided with the projection that prevents that operation element 40 from rotating, and is connected with the clamping device 10 that is used for operation element 40 is clamped to fast axle head 234 on the driving shaft 23.

Clamping device 10 comprises tightening member 1, but tightening member 1 is configured to have the flange portion 11 of clamping operation element 40 and in fact perpendicular to the projecting shaft 12 of flange portion 11, and projecting shaft 12 can be inserted in the cavity volume 233 and the assembly locking or unclamp of being locked; Latch assembly comprises sliding sleeve 5, latch segment 6 reaches the steel ball 7 with latch segment 6 butts, sliding sleeve 5 is set in outside the axle 232, sliding sleeve 5 is provided with hole 51, pin 4 is installed in the hole 51, pin 4 pass on the axle 232 in axial direction on the elongated slot 235 offered, spring 3 is propped up by pin 4 in axle 232, also be provided with recess 52 on the sliding sleeve 5, recess 52 can cooperate with the steel ball 7 in the hole 236 on being placed in axle 232, when the position of the position of recess 52 and steel ball 7 at once, steel ball 7 can fall in the recess 52, thereby vacates the position for latch segment 6 radially outward moves, at this moment, latch segment 6 can unclamp the projecting shaft 12 of tightening member 1, tightening member 1 can take out in axle 232, and can unload operation element 40, when sliding sleeve 5 moves on the position that recess 52 and steel ball 7 stagger in the axial direction, steel ball 7 is extruded recess 52, at this moment, steel ball 7 compresses projecting shaft 12 with latch segment 6 to the center, make tightening member 1 by firm grip in axle 232.Recess 52 is provided with is convenient to the inclined-plane that steel ball 7 slides.The position that slide block 6 and projecting shaft 12 can engage is provided with shape closing component structure 61,121, and this shape closing component structure 61,121 can be the tooth that is mutually locked or circumferential groove etc.

Pin 4 in the present embodiment also can be configured to directly be formed at projection or the flange on the sliding sleeve 5 in other embodiments, this projection or flange can pass the groove 235 on the axle 232 and extend in the cavity volume 233, and place between latch segment 6 and the spring 3, can transmit or intercept spring 3 and affact axial force on the latch segment 6.

Sliding sleeve 5 moves in the axial direction by the cooperation of mobile device 30 and spring 3, mobile device 30 can comprise the cam spanner 31 that is used to operate and act on interlock shift fork 32 on the sliding sleeve 5, cam spanner 31 and shift fork 32 are arranged on respectively on instrument 20 bodies pivotly, thereby shift fork 32 rotates under the cam surface effect of spanner 31 and can contact and drive sliding sleeve 5 with sliding sleeve 5 and move; Effect has and makes its torsion spring with more closed trend 34 on the spanner 31, and therefore when tool work, spanner 31 can not rock because of the dither of instrument; Effect has back-moving spring 33 on the shift fork 32.

Latch segment 6 is spacing by limiting plate 9 in the axial direction, known methods such as limiting plate 9 usefulness screws are fixed in the cavity volume 233, with limiting plate 9 corresponding opposite side effects biasing spring 8 is being arranged, therefore latch segment 6 can have displacement slightly in the axial direction, the toothed portion of being convenient to projecting shaft 12 and latch segment 6 is to tooth and engagement, reduce the wearing and tearing at engagement position, also move on slightly simultaneously, and drive tightening member 1 and promote and further clamp operation element 40 application of force space is provided for spring 3 promotes latch segments 6; Bevelled boss 62 on the end face of latch segment 6, biasing spring 8 can be pressed on the inclined-plane of boss 62, make the trend of latch segment 6 oriented radial center bias voltages, when the projecting shaft 12 of tightening member 1 was inserted into latch segment 6 centres, operating personnel can experience the action to tooth, strengthen operation sense, in addition, also can produce certain damping action, avoid when needs are pulled out projecting shaft 12, projecting shaft 12 free slippages and dropping projecting shaft 12.

A collar 55 also can be established in the position with hole 51 at sliding sleeve 5, is used for pins 4 pins that are installed in the hole 51 are stopped up in hole 51, limits pin 4 moving diametrically.

Describe the process of the utility model power tool installment work element preferred embodiment below in detail.

Clamp operation element:

As shown in Figure 1, spanner 31 no longer applies power above shift fork 32, and shift fork 32 moves under back-moving spring 33 effect throws off and the contacting of sliding sleeve 5.Sliding sleeve 5 with pin 4 is upwards promoted by spring 3, and steel ball 7 is extruded from the recess 52 of sliding sleeve 5, is pushing away latch segment 6 and is pressing to projecting shaft 12, and latch segment 6 and projecting shaft 12 are fully meshed.Because of latch segment 6 has by the trend of moving on spring 3 bias voltages, and 12 engagements of latch segment 6 and projecting shaft, thus projecting shaft 12 have by on the trend carried, thereby operation element 40 is pressed on the driving shaft 23.

Discharge operation element:

As shown in Figure 2, pull spanner 31 clockwise, shift fork 32 rotates counterclockwise, to pressing down sliding sleeve 5, sliding sleeve 5 is being with and is being sold 4 pressing springs 3, and pin 4 power that act on the latch segment 6 are cancelled, so it is descending that biasing spring 8 promotes latch segment 6, till latch segment 6 limited plates 9 block.Still be locked diametrically piece 6 and sliding sleeve 5 of steel ball 7 is spacing.

Continue to pull spanner 31, sliding sleeve 5 continues to move down into the position of its recess 52 and steel ball 7 correspondences, and steel ball 7 can be dropped into recess 52, to such an extent as to latch segment 6 radially can have certain displacement.

Pull down tightening member 1, under the power effect that projecting shaft 12 pulls down, latch segment 6 footpaths are outwards moved and are unclamped projecting shaft 12, and tightening member 1 can be pulled out from instrument fully.

The also available in another embodiment pin 7 ' of steel ball 7 in the latch assembly in the above-mentioned embodiment replaces, as shown in Figure 5, pin 7 ' is located in the hole 236, one end can with latch segment 6 butts, the other end can be fitted in the recess 52 that is located on the sliding sleeve 5, the radial distance in the axle center of these recess 52 relative drive shafts 23 is greater than the radial distance in the axle center of inner cylinder face 53 relative drive shafts 23 of sliding sleeve 5, therefore when sliding sleeve 5 is mobile in the axial direction, pin 7 ' can slide between recess 52 and inner cylinder face 53, moves diametrically thereby drive latch segment 6.Recess 52 in the present embodiment can be configured to have the part of curved surface, also can be made as the part on inclined-plane.

Steel ball 7 in the latch assembly in the above-mentioned embodiment or sell 7 ' and in another embodiment, can also save, and directly latch segment 6 and sliding sleeve 5 are cooperated by the inclined-plane, as shown in Figure 6, latch segment 6 partly passes hole 236, this passes and establishes the inclined-plane adaptive with sliding sleeve 5 on the part, when sliding sleeve 5 is mobile in the axial direction, can realizes latch segment 6 moving diametrically, thereby step up or unclamp the projecting shaft 12 of tightening member 1.

The power tool that the utility model disclosed is not limited to the structure of content described in the above embodiment and accompanying drawing representative.On basis of the present utility model to the shape of member wherein and conspicuous change that the position is done, substitute or revise, all within the claimed scope of the utility model.

Claims

1. power tool comprises:

Drive the driving shaft of operation element;

It is characterized in that: described latch assembly also comprises is located at the outer moving member of described driving shaft, described moving member has first and second portion, the radial distance in the axle center of the described relatively driving shaft of described first is unequal with the radial distance in the axle center of the relative described driving shaft of described second portion, when described first cooperates with described locking member directly or indirectly, described locking member is on the described locked position, when described second portion cooperated with described locking member directly or indirectly, described locking member was on the described released position.

2. power tool according to claim 1 is characterized in that: the locking portion that can directly cooperate with described first and second portion is set on the described locking member.

3. power tool according to claim 2 is characterized in that: described locking portion can be configured to have the part on inclined-plane.

4. power tool according to claim 1 is characterized in that: described latch assembly also comprises the middleware that places between described locking member and the described moving member, and described middleware selectively is positioned in the first of described moving member or on the second portion.

5. power tool according to claim 1 is characterized in that: on the projecting shaft of described tightening member and described locking member be provided with the shaping locking member, be used for described projecting shaft is fixed on described locked position with being shaped locking.

6. power tool according to claim 5 is characterized in that: the projecting shaft of described securing member is provided with toothed portion, and described toothed portion cooperates with coupling toothed portion on the described locking member.

7. according to claim 2 or 4 described power tools, it is characterized in that: described locking member can move between described locked position and released position, and its direction that moves is in fact perpendicular to described projecting shaft.

8. power tool according to claim 7 is characterized in that: also comprise mobile device, described mobile device and described flexible member cooperate makes described moving member move on the axis direction of described driving shaft.

9. power tool according to claim 8 is characterized in that: when described locking member was in the locked position, described mobile device can be thrown off a distance by described relatively moving member.

10. power tool according to claim 7 is characterized in that: described locking member is located in the cavity volume of described driving shaft, described moving member be provided with pass described driving shaft and extend in the described cavity volume can with the connector of described locking member butt.

11. power tool according to claim 7 is characterized in that: described moving member is configured to be set in the sliding sleeve on the described driving shaft, and described middleware is configured to be placed in steel ball or the pin in the hole on the described driving shaft.

12. power tool according to claim 1 is characterized in that: effect has a biased element on the described locking member, described biased element with described locking member to the direction bias voltage that overcomes the thrust that produces when described projecting shaft inserts.

13. power tool according to claim 12 is characterized in that: on described locking member end face, be provided with the boss on band inclined-plane, be used for cooperating with described locking member to center bias voltage radially with described biased element.

14. according to the described power tool of above-mentioned each claim, it is characterized in that: described driving shaft is driven by the mode with vibration about its longitudinal axis.